suspects and making the arrest. He is good friends with Rigsby and his deadpan sense of humor and calm demeanor both complements and contrasts Rigsby's happy-go-lucky nature. Fellow CBI agent Sam Bosco even nicknamed Rigsby and Cho "Bert and Ernie" respectively after the eponymous Sesame Street characters. Rigsby has sometimes been the recipient of Cho's deadpan, as shown when Cho mocked him for lacking the courage to ask Van Pelt out in season 2 and also tells him that he had known about the Bert and Ernie nickname but chose not to tell him. They often bet on Jane's abilities and the secret behind his "parlor tricks". In "Bloodstream", Cho is briefly placed in command of the team by LaRoche after Lisbon insults LaRoche. His loyalty to Lisbon is shown in this episode, as he offers to let her call the shots, but she refuses. In one episode, he shows some belief in the supernatural when a witch apparently casts a spell on him. In season 3 episode "Bloodsport", Cho is forced into an uncomfortable position when he finds out Special Agent Wayne Rigsby, while lying to a parole officer to give his father an alibi, has named him as a person that could corroborate the alibi. Cho is angered and states that in his nearly a decade of service in law enforcement, he has never lied to a fellow officer. Though unhappy about it, when LaRoche questions him, he sides with Rigsby and lies. He eventually forgives Rigsby. In the third season episode "Rhapsody in Red", he meets a young pickpocket with a similar background to himself when he was young. The pickpocket steals Cho's car, and is later caught and held at CBI headquarters until foster care can take him. Cho ends up helping the kid prove his father, who had been arrested for robbing a store, is innocent. At the end of the episode, father and son are reunited, and Cho laughs as Rigsby reacts to having had his wallet stolen. Early in season 4, Cho injures his back when he is hit by a car while chasing a suspect. This leaves him with constant and severe pain which he overcomes with the use of painkillers, of which he takes more and more as the pain remains. He falls asleep on the job and it almost costs Rigsby his life. He is later seen flushing the pills